I would say that this sentence contains examples of colloquialism.
Colloquialism is <span>a word or phrase that is not formal or literary and is used in ordinary or familiar conversation.</span>
In Malory's <span>Morted'Arthur, </span><span>Arthur is warned by Sir Gawain not to lead his army against Mordred the next day. If Arthur fights Mordred tomorrow, he and many men on both sides will die. Gawain tells Arthur to postpone the battle for a month to give Lancelot time to arrive. </span>
yes
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An argument is invalid if and only if all the premises is true and the conclusion is false.
We can test the invalidity of the argument by assuming all the premises are true and seeing whether it is possible for the conclusion to be false. If the conclusion is possible to be false, then, the argument is invalid.
A valid argument, on the other hand, is valid if and only if it is necessary that:
1) if all of the premises are true, then the conclusion is true
2) if all of the premises are true, then the conclusion must be true
3) it is impossible that all the premises are true and the conclusion is false.
